searching an array of classes

Question

I have an array of classes. Each class contains two values (UserName, and UserID).

I need to search the array such as "give my the ID for username Bob Smith."

Other than looping through each value in the array, is there another way I can search it such as searcharray(username, "Bob Smith")?

chris · Answer

Excellent! Thanks for the custom code. I walked through it all so I'd understand it. I'm sure I'll be using it a lot in my current program.

Alan · Answer

If you're using .NET 2.0 or greater, you can do it after a fashion with code like this: using System; class Test { static string matchUserName; static void Main() { MyClass[] myArray = new MyClass[3]; myArray[0] = new MyClass("Fred Bloggs", 12); myArray[1] = new MyClass("Bob Smith", 25); myArray[2] = new MyClass("Jack Jones", 42); matchUserName = "Bob Smith"; MyClass mc = Array.Find(myArray, MatchesUserName); if (mc != null) { Console.WriteLine("The UserId for {0} is {1}", matchUserName, mc.UserId); } else { Console.WriteLine("{0} is not in the array", matchUserName); } Console.ReadKey(); } private static bool MatchesUserName(MyClass mc) { if (mc.UserName == matchUserName) { return true; } return false; } } class MyClass { private string userName; private int userId; public string UserName { get {return userName;} } public int UserId { get {return userId;} } public MyClass (string userName, int userId) { this.userName = userName; this.userId = userId; } }

searching an array of classes

Answers (2)